[pavanky]

Because the current series (GTX 680) is severely stunted for CUDA compared to the GTX 580. The single precision performance of 680 barely beats the 580. The double precision performance on the GTX series sucks in general, but NVIDIA actually made it twice as worse going from 580 to 680. (Benchmarks linked at bottom).

The reasoning may have been to focus the GTX series more on gaming. Or it could be more sinister to push more people towards their costlier Tesla Line. Considering that they came out with the K10 which has terrible double precision performance, but incredible single precision performance, I think they are heading towards multiple Tesla lines and want to push the GTX series away from the serious GPGPU computing.

Disclaimer: The following is my company's blog. The post is authored by me. http://blog.accelereyes.com/blog/2012/04/26/benchmarking-kep...

[tisme]

Thank you very much for that reply.

I have a 590 and I'm pretty happy with it, been eying the 690 but I wasn't able to find any real world non gaming benchmarks.